Lap Shear Testing

 

DESCRIPTION
Two sets of composite samples were received for lap shear testing in accordance with ACI 440.3R-04.

MECHANICAL
All samples were conditioned for a minimum of 40 hours at 20 ± 3°C and 50 ± 5% relative humidity. All samples were tested in similar conditions.

LAP SHEAR TESTING

Five samples were received for lap shear testing in accordance with ACI 440.3R-04 which in turn referred to ASTM D3039. The samples were tested in the same condition that they were received in. After recieving the samples, it was noted that they had uneven and jagged gage sections. The lap area of the samples was uneven and the thickness varied. The samples were then tested on a servo-hydraulic test stand at a crosshead speed of 0.05 millimeters per second.

The sample results are presented in Table 01.

Table 01 (Lap Shear Results)

Sample Overlap
Dimensions
(in)
Shear
Strength
(psi)
Failure
Strain
1 1.034 x 5.55 369 Tension
Failure
2 1.060 x 6.00 156 Tension
Failure
3 0.960 x 5.36 342 Tension
Failure
4 1.085 x 5.05 324 Tension
Failure
5 1.061 x 5.76 218 Tension
Failure
Average -- 282 --
St. Dev. -- 90.7 --


RESULTS
Each of the samples did not fail in the lap shear area.